OK8/BK8 vs YG8
Ceramic · grade comparison
OK8/BK8 and YG8 are both ceramic grades. YG8 is the more ductile: elongation 0.1% versus 0% for OK8/BK8, and OK8/BK8 is harder (1,450 HV vs 1,350 HV). OK8/BK8 runs hotter in service (800°C vs 600°C continuous).
OK8/BK8Choose it when the part sees heat.
YG8Choose it when the part is bent, formed or impact-loaded.
OK8/BK8 vs YG8: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all ceramic grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all ceramic grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Bulk Modulus
Elongation at Break
Compressive Strength
Flexural Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 600 GPa87 Msi · Shear Modulus 245 GPa35.5 Msi · Poisson's Ratio 0.22 · Tensile Strength (Ultimate) 1,200 MPa174 ksi · Hardness, Knoop 1,400 HK · Hardness, Mohs 9
Physical
Density and transition temperatures.
Density
Same in both: Melting Point (Solidus) 1,320°C2,408 °F · Porosity 0.02%
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Thermal Conductivity 75 W/m·K43.3 BTU/hr·ft·°F · Specific Heat Capacity 220 J/kg·K0.05 BTU/lb·°F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 2×10⁻⁷ Ω·m7.87 µΩ·in · Volume Resistivity 2×10⁻⁵ Ω·cm
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Polishability
Same in both: Sintering / Firing Temperature 1,420°C2,588 °F
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Same in both: Embodied Water 400 L/kg47.9 gal/lb · Typical Recycled Content 30%
Common Calculations
Ratios derived from the values above.
Specific Stiffness (E / density)
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Strength (UTS / density) 82 kN·m/kg
Strength versus weight
Yield strength against density for every ceramic grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | OK8/BK8 | YG8 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
OK8/BK8 vs YG8 — frequently asked
What is the difference between OK8/BK8 and YG8?
OK8/BK8 and YG8 are both ceramic grades. YG8 is the more ductile: elongation 0.1% versus 0% for OK8/BK8, and OK8/BK8 is harder (1,450 HV vs 1,350 HV). OK8/BK8 runs hotter in service (800°C vs 600°C continuous).
Which is cheaper, OK8/BK8 or YG8?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose OK8/BK8 over YG8?
Pick OK8/BK8 when the part sees heat. Pick YG8 when the part is bent, formed or impact-loaded.
Ready to make it?
Upload a CAD file and FabDigit prices the part in OK8/BK8 and YG8 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.